Assessment of probabilistic system effects on the reliability of timber trusses
(2002) In Materials and Structures 35(253). p.573578 Abstract
 In structural engineering the system effect is known as the possibility of transversal collaboration among parallel loadbearing elements due to mechanical load sharing. The statistical system effect, related to the variation of strength within structural timber elements, is investigated in this paper. The system investigated is a roof truss of Wtype. The strength variation within and between timber members is described with a statistical model based on stochastic variables representing position of weak sections and length of weak regions, strength of weak sections and strength between weak sections. With the statistical model, the cumulative distribution of a Combined Stress Index (CSI), which is a measure of the stress levels in the... (More)
 In structural engineering the system effect is known as the possibility of transversal collaboration among parallel loadbearing elements due to mechanical load sharing. The statistical system effect, related to the variation of strength within structural timber elements, is investigated in this paper. The system investigated is a roof truss of Wtype. The strength variation within and between timber members is described with a statistical model based on stochastic variables representing position of weak sections and length of weak regions, strength of weak sections and strength between weak sections. With the statistical model, the cumulative distribution of a Combined Stress Index (CSI), which is a measure of the stress levels in the truss, is determined with Monte Carlo simulations. The results from the simulations are used to determine the reliability level of the truss considering the effect of within member variation of the timber strength. It is shown that the load bearing capacity of a truss is increased significantly for a given reliability level, since the probability is low that sections with locally high stresses will coincide with weak sections. The increase in the estimated load bearing capacity for a Wtruss is of the order 1520% for spruce of Scandinavian origin and 3035% for Radiata Pine. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/record/320608
 author
 Hansson, Martin ^{LU} and Thelandersson, Sven ^{LU}
 organization
 publishing date
 2002
 type
 Contribution to journal
 publication status
 published
 subject
 in
 Materials and Structures
 volume
 35
 issue
 253
 pages
 573  578
 publisher
 Springer
 external identifiers

 wos:000180054300009
 scopus:0036850593
 ISSN
 13595997
 DOI
 10.1007/BF02483126
 language
 English
 LU publication?
 yes
 id
 c81494a5a5004039ae1277c053f7999f (old id 320608)
 date added to LUP
 20070823 13:29:49
 date last changed
 20170101 05:18:21
@article{c81494a5a5004039ae1277c053f7999f, abstract = {In structural engineering the system effect is known as the possibility of transversal collaboration among parallel loadbearing elements due to mechanical load sharing. The statistical system effect, related to the variation of strength within structural timber elements, is investigated in this paper. The system investigated is a roof truss of Wtype. The strength variation within and between timber members is described with a statistical model based on stochastic variables representing position of weak sections and length of weak regions, strength of weak sections and strength between weak sections. With the statistical model, the cumulative distribution of a Combined Stress Index (CSI), which is a measure of the stress levels in the truss, is determined with Monte Carlo simulations. The results from the simulations are used to determine the reliability level of the truss considering the effect of within member variation of the timber strength. It is shown that the load bearing capacity of a truss is increased significantly for a given reliability level, since the probability is low that sections with locally high stresses will coincide with weak sections. The increase in the estimated load bearing capacity for a Wtruss is of the order 1520% for spruce of Scandinavian origin and 3035% for Radiata Pine.}, author = {Hansson, Martin and Thelandersson, Sven}, issn = {13595997}, language = {eng}, number = {253}, pages = {573578}, publisher = {Springer}, series = {Materials and Structures}, title = {Assessment of probabilistic system effects on the reliability of timber trusses}, url = {http://dx.doi.org/10.1007/BF02483126}, volume = {35}, year = {2002}, }